Snorkels

The snorkel is another relatively simple piece of diving and snorkelling equipment that offers you the convenience and relaxation of breathing at the surface indefinitely, without needing to lift your head out of the water.
This simple invention has been a boon for the sport of skin diving (commonly referred to today as snorkelling), since it allows you to view the underwater world uninterrupted. It is also considered a standard piece of equipment for scuba diving, since it allows you to conserve the air in your tank while swimming on the surface.